New Ionic Lubricants for Magnetic Thin-Film Media

• Published in: IEEE transactions on magnetics Vol. 50; no. 11; pp. 1 - 4
• Main Authors: Kondo, Hirofumi, Hatsuda, Kouki, Tano, Nobuo, Ito, Makiya, Kyungsung Yun, Watanabe, Masayoshi
• Format: Journal Article
• Language: English
• Published: New York IEEE 01-11-2014; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Friction; Lubricants; Magnetic liquids; Magnetic recording; Magnetism; Media; Stability analysis; Thermal stability; heat-assisted magnetic recording; thermal stability; Friction; lubricant
• ISSN: 0018-9464; 1941-0069
• DOI: 10.1109/TMAG.2014.2320272

This paper deals with the effect of the molecular structure of the newly synthesized protic ionic liquids (PILs) on the tribological and thermal properties. A higher ΔpK a between the acid and base is effective for the thermal durability. It is more effective for the thermal stability to modify the sulfonate with a super base, and the DBU and TBD derivatives have decomposition temperatures greater than 420 °C. The PILs are adsorbed on the media surface with a high orientation. The stronger adsorption due to the intensive adhesive interaction of the polar group is necessary for the friction reduction. A sufficient length of the hydrocarbon chain causes an extensive cohesive interaction, which compensates for the mechanical durability.